Towers and lines, without the climb
A drone gets close-up images of antennas, mounts, hardware and conductors from a safe standoff, so fewer people climb and line crews go only where the images point.
What a drone does on a tower or a line
Telecom towers, rooftop antenna sites, distribution poles, transmission structures and substations all need regular visual checks. Traditionally that means a climber on a tower, a bucket truck at a pole, or a helicopter along a line. Each is costly, weather-dependent and, for climbing, one of the more dangerous jobs in the trade.
A drone flies a planned orbit and vertical sweep of the structure, then moves in for detail: antenna mounts and azimuth, coax and fibre runs, bolts and welds, corrosion, lighting, guy wire attachments, insulators, crossarms, conductors, vegetation encroachment and bird nests. For carriers and tower owners, a photogrammetry model of the structure can support audits and loading reviews (see as-builts and digital twins). For utilities, thermal imaging can show hot connections and failing components when the circuit is loaded.
The images are evidence for the people who decide: a tower engineer, a carrier's site team, a utility's asset group, a qualified line crew. The drone does not replace their judgment, and on utility work it does not replace their safety procedures.
Altitude, certificates and clearances
| Topic | Canada | United States |
|---|---|---|
| General altitude limit | 122 m (400 ft) above ground under CARs Part IX | 400 ft above ground under FAA Part 107 |
| Flying near a tall structure | Close to a building or structure (within 61 m horizontally), flights may go up to 30 m above it under specific conditions. Since November 4, 2025, Advanced pilots can conduct 'sheltered operations' near structures under set limits. Beyond that, a special flight operations certificate is needed. | Within a 400 ft radius of a structure, the drone may fly up to 400 ft above the structure's top |
| Pilot certificate | Advanced Operations certificate for controlled airspace, flying near people, and sheltered operations. Many tower and utility sites sit in controlled airspace or near roads. | Remote Pilot Certificate; LAANC or FAA authorization in controlled airspace |
| Distance from energized lines | Set by provincial workplace safety rules and the utility. In BC, WorkSafeBC minimum approach distances apply to equipment as well as people, starting at 3 m for lines over 750 V up to 75 kV and increasing with voltage. | Set by OSHA minimum approach distances and the utility's own procedures |
Clearances are a floor, not a target
Regulatory approach distances are the minimum. Utilities often set larger standoffs for aircraft, require written permission to fly near their assets, and may need their own crew on site or a line placed in a particular state. On any job near energized equipment we plan the standoff with the utility first, and we never fly near a line on the assumption that it is de-energized.
The physics matters too. Strong electromagnetic fields near high-voltage lines and substations, and RF energy from antennas, can disturb a drone's compass and links. Conductors and guy wires are hard to see on a screen. Pilots fly these sites with extra standoff, manual control where automated modes are unreliable, and a visual observer where the job calls for one. Read more about how we plan in safety and preparing a site for a flight.
Who needs what from whom
Tower owner or carrier
- They need from you
- Current images of every face and mount, tied to the site ID, for audits, loading reviews and planning upgrades.
- You need from them
- Site ID, access to the compound, any RF shutdown or exclusion arrangements and their capture checklist.
- On the DroneLink record
- Each site is a DroneLink project record; every visit is added to it, so the history is in one place.
Structural engineer
- They need from you
- Detail on connections, members and appurtenances, plus a model when geometry matters.
- You need from them
- The specific components to capture and the resolution required.
- On the DroneLink record
- They pin comments on images and request reshoots through the review tool.
Utility asset group and line crew
- They need from you
- Condition data on poles, insulators, hardware and vegetation, without an outage where possible.
- You need from them
- Written permission, standoff distances, switching or hold-off arrangements, and a utility contact on the day.
- On the DroneLink record
- Findings are delivered by link so the crew sees the exact component before they roll a truck. See for municipalities and utilities.
Landowner
- They need from you
- Notice and respect for their property.
- You need from them
- Access to a safe take-off spot.
- On the DroneLink record
- The utility or carrier's access agreement comes first; we follow it.
Where tower and line flights go wrong
Compass errors near the structure
Magnetic and RF interference cause the aircraft to drift or reject automated modes.
Flying before the utility says yes
A crew shows up without permission or a standoff agreement.
Images nobody can tie to a component
Hundreds of close-ups without face, level or asset ID.
Questions
Can you fly a drone above 400 feet to inspect a tower?
In the US, Part 107 allows flight up to 400 ft above a structure's top within 400 ft of it. In Canada, the general limit is 122 m, with allowances near structures under specific conditions and a special flight operations certificate beyond that. Check the current rules for the site.
How close can a drone fly to power lines?
Workplace safety rules set minimum approach distances that increase with voltage, and in BC they apply to equipment such as a drone. Utilities often require more. The standoff is agreed with the utility before any flight.
Do I need an Advanced certificate to inspect towers in Canada?
Many tower and utility jobs are in controlled airspace, near roads or people, or close to structures, which calls for an Advanced Operations certificate. Our Vancouver Island flights are flown by Advanced-certified pilots.
Can drones replace tower climbers?
They reduce climbs, especially for routine visual checks and pre-job planning. Hands-on work, repairs and some inspections still need a qualified climber.
Can a drone detect hot connections on power lines?
A radiometric thermal camera can show abnormal heating on connections and components when the circuit is carrying load. A utility's qualified staff interpret and act on the findings.
Does RF from antennas affect drones?
Strong RF and magnetic fields can interfere with a drone's compass and links. Pilots plan standoff and flight modes for the site, and coordinate with the carrier on exclusion zones where required.
What drives the cost of a tower or utility drone inspection?
Structure height and type, number of sites or kilometres of line, airspace permissions, utility coordination, thermal requirements, travel and the level of reporting.
Tell us about your Vancouver site.
An address and what you need is enough to start. We reply with the price, who will fly it and when.